Random cards Flashcards
Why may fluoride added to salt?
to improve dental health
Why may a solution go cloudy after a reaction? Why?(hint: no limewater and carbon dioxide stuff)
a precipitate is formed as precipitates are insoluble in water
precipitate is a solid in solution after a reaction
How could the student ensure the her measurements are accurate?
Repeat the experiment
so anomalous results could be excluded
and then mean could be calculated
Why should all political parties be represented in a debate about a scientific issue?
So it is fairer
Why would an independent company be better at deciding whether something is safe to drink over a company?
will be unbiased
Why might a well-respected scientist lead to a change in the outcome of a decision?
More likely to have influence over people
as are more knowledgeable
Why should evidence be used over opinions when deciding issues?
more likely to be correct
or
based on proof
Lead is (…)
toxic
How can volume of a gas be reduced?
Cool (the gas, so it condenses and forms a liquid)
or
Put the gas under pressure
Give one ethical reason why iodine should not be added to salt
People should have he right ti choose
In a reaction, why must excess hydrogen be burned off?
To prevent hydrogen escaping
as hydrogen is explosive
